Chosen Government Railway Pashiko class (パシコ) Korean National Railroad Pasi5 class (바시5) Korean State Railway Pasio class (바시오)
Sentetsu Pashiko class locomotives パシコ7 and パシコ13
Type and origin Power type Steam Builder Gyeongseong Works, Kawasaki Build date 1939 Gyeongseong (2) 1940–1944 Kawasaki (40) Total produced 40
Specifications Configuration: ​  • Whyte 4-6-2 Gauge 1,435 mm (4 ft 8+1⁄2 in) Driver dia. 1,850 mm (73 in) Length 23,756 mm (77 ft 11.3 in) Width 3,170 mm (10 ft 5 in) Height 4,700 mm (15 ft 5 in) Loco weight 112.00 t (110.23 long tons) Tender weight 84.00 t (82.67 long tons) Fuel capacity 14.0 t (13.8 long tons) Water cap. 35,000 L (9,200 US gal) Firebox: ​  • Grate area 6.20 m2 (66.7 sq ft) Boiler: ​  • Small tubes 75 x 51 mm (2.0 in)  • Large tubes 120 x 90 mm (3.5 in) Boiler pressure 15.0 kgf/cm2 (213 psi) Heating surface: ​  • Firebox 27.40 m2 (294.9 sq ft)  • Tubes 252.60 m2 (2,719.0 sq ft)  • Total surface 280.00 m2 (3,013.9 sq ft) Superheater: ​  • Heating area 113.70 m2 (1,223.9 sq ft) Cylinders 2 Cylinder size 580 mm × 660 mm (23 in × 26 in) Valve gear Walschaerts
Performance figures Maximum speed 110 km/h (68 mph) Tractive effort 162.0 kN (36,400 lbf)
Career Operators Chosen Government Railway Korean National Railroad Korean State Railway Class Sentetsu: パシコ KNR: 바시5 KSR: 바시오 Number in class Sentetsu: 42 Numbers Sentetsu: パシコ1–パシコ42 Delivered 1939–1944

The Pashiko class (パシコ) locomotives were a group of steam tender locomotives of the Chosen Government Railway (Sentetsu) with 4-6-2 wheel arrangement. The "Pashi" name came from the American naming system for steam locomotives, under which locomotives with 4-6-2 wheel arrangement were called "Pacific".

In all, Sentetsu owned 144 locomotives of all Pashi classes, of which 141 survived the war; of these, 73 went to the Korean National Railroad in South Korea and 68 to the Korean State Railway in North Korea.^[1]

Sentetsu designed the Pashiko class as a successor to the Pashishi class, with the first example, パシコ1, being delivered from Sentetsu's Gyeongseong Works in October 1939, and the second following a month later. They were not only the largest of all Sentetsu passenger locomotives in size, but at 159.8 t (157.3 long tons) they were the heaviest of all Sentetsu locomotives of any type, and with a maximum speed of 110 km/h (68 mph) they were the fastest as well.^[2]

Like the Matei class, which was the largest of all Sentetsu's freight locomotives, the Pashiko class had a firegrate area of 6.2 m² (67 sq ft), and like the Pashishi and its related classes, it was designed to use lignite abundant in Korea, which is less efficient than anthracite and thus requires a large heating area, and featured a combustion chamber firebox and a conical boiler. Unlike the other Pashi classes, which had drivers of 1,750 mm (69 in) diameter, the Pashiko had even larger drivers of 1,850 mm (73 in).^[2]

After the Liberation and partition of Korea, they were divided between North and South, but the specifics of which engine went where are unclear.

At least eighteen Pashiko class engines went south to the Korean National Railroad, where they became 파시5 (Pasi5) class, and they were widely used on passenger trains until at least 1967.^[3] 파시5-5 was partially streamlined and given a special livery of black with white and red trim in the mid-1950s by the US Army Transportation Corps railway crews.^[4]

The locomotives taken over by the Korean State Railway were initially designated 바시오 (Pasio) class. The total number, their service lives and subsequent fates are unknown, but they were probably retired by the end of the 1960s.